Hello,

I have a problem mixing vlan with lan in same interface eth0.
I connect two cpu's through a marvel switch, (and in one of the CPU i run linux 2.6.35.)
The connection between the cpu (10.0.1.10) works fine until
I enter the "vconfig add eth0 80" commando(in linux cpu) to define a vlan, then LAN communication i.e 10.0.1.10, stops to work.The VLAN definition is successful and VLAN works fine.
But the LAN do not work.If I remove the vlan the LAN works again.
Can someone explain this behavor.
Thanks

Not sure I really understand what you're trying to do here, you have two different machines connected to a dumb switch? If that's the case, then if one uses vlan tags and the other one does not, then that'd never work, unless the switch is equally aware on a per port basis.

Hi,

Very easy, I have 2 cpu connected though a swicth(not a dumb switch).They can comunicate fine though ssh.
Now in the Linux cpu as soon as I enter the command "vconfig add eth0 80", the communication with the other cpu (ssh) stops to work.
I enter the command in order to define a vlan, and if I define the vlan (in both cpu) the vlan communication works fine.
But the ssh connection will not work, until again I remove the vlan in the linux cpu.Tehn ther ssh communication works again.

Resuming as soon as I enter the vconfig command (in linux cpu) the ssh communication stops

Right, to that's "server", not "CPU". If both switches are exceting 802.1q tags in ethernet frames AND the switch will pass them, then it should work. Is the tagged packet leaving the nic on one? Is it arriving on the other? tcpdump / wireshark is very useful for this kind of thing. what is "vlan communication" meaning here, if it's working without ssh working.

Hi,

Some clarification,, if I define the vlan on the non linux server the ssh stays up.Thata is why I believe this is a linux issue.
Both have 802.1q, so the vlan works fine.I defined two vlan with different id and that works ok.
it looks like the ssh frames have tag =0 , (I can see it during ping) and I can see the arp request and the answer to it, but
the ping is failing.
Thanks